How to make solid hair for girl (not strand by strand)
Typically this is one or a couple of meshes, so it is mainly matter of picking the proper path rather than choosing a specific tool.
A way to approach would be sculpting indeed, if you prefer modeling it then create a rough mesh which will follow roughly the shape of the head, then extrude few faces to make this spiky ends of the strands and apply a subdivision modifier.
There must be plenty of examples out there, try the combination of keywords &quot;sculpting hair mesh&quot; either on google or youtube.